Answer:
For each $1000 spent on advertising, the dealership sell 8 vehicles.
Explanation:
To find the exact answer, we can find the linear equation and then use it to calculate the number of vehicles sold for each $1000 spent on advertising.
First, we choose two points from the graph
, this two points will be used to find the slope.

Now, we use the point-slope formula to find the linear expression:

So, we replace x=1, which represent $1000, and see what value returns for y:

Therefore, for each $1000 spent on advertising, the dealership sell 8 vehicles.